Roger Glover played all the instruments on Smoke on the Water--but decided to credit the others in the band instead of taking all the credit after they encouraged him not to keep the kazoo track in the final mix.
He also recorded them all on Tubular Bells. Granted, Mike Oldfield wrote the music but was too inexperienced in the studio to record it all in the one day of studio time he was allotted so called in Glover. He just hummed each part to Glover who recorded it. Some of the grunting bits are Oldfield's humming and grunting of the tune that got recorded and Glover forgot to overdub with the anticipated saxophone part as it was such a rush job. And those aren't really tubular bells (far too expensive to hire in) but recordings of some half-filled milk bottles tapped with a pen slowed down and looped.